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Investments - Selected Statement of Operations Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Total investment income $ 80,529 $ 95,327 $ 249,682 $ 280,471
Interest and other financing expenses 31,720 37,661 94,232 101,790
Total expenses 51,002 60,791 155,348 171,469
Net investment income 34,071 35,506 103,286 111,734
Net realized (losses) gains on investments     51,223 (43,524)
Net change in unrealized (depreciation) appreciation of investments     (111,171) 23,368
SLP III        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 16,172 17,860 46,239 51,245
Other income 64 49 253 134
Total investment income 16,236 17,909 46,492 51,379
Interest and other financing expenses 8,227 8,888 24,444 26,599
Other expenses 329 229 932 737
Total expenses 8,556 9,117 25,376 27,336
Net investment income 7,680 8,792 21,116 24,043
Net realized (losses) gains on investments (1,294) 74 (829) (5,833)
Net change in unrealized (depreciation) appreciation of investments (1,122) (1,493) (9,439) 5,005
Net increase in members' capital 5,264 7,373 10,848 23,215
SLP IV        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 11,308 12,906 31,291 37,025
Other income 65 10 156 77
Total investment income 11,373 12,916 31,447 37,102
Interest and other financing expenses 5,986 6,694 16,171 19,436
Other expenses 258 202 673 651
Total expenses 6,244 6,896 16,844 20,087
Net investment income 5,129 6,020 14,603 17,015
Net realized (losses) gains on investments (541) 133 (681) (4,741)
Net change in unrealized (depreciation) appreciation of investments (1,569) (2,076) (6,675) 1,468
Net increase in members' capital $ 3,019 $ 4,077 $ 7,247 $ 13,742